github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/cdc/sink/dmlsink/mq/dispatcher/partition/key.go (about)

     1  // Copyright 2023 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package partition
    15  
    16  import (
    17  	"github.com/pingcap/tiflow/cdc/model"
    18  )
    19  
    20  // KeyDispatcher is a partition dispatcher which dispatches events
    21  // using the provided partition key.
    22  type KeyDispatcher struct {
    23  	partitionKey string
    24  }
    25  
    26  // NewKeyDispatcher creates a TableDispatcher.
    27  func NewKeyDispatcher(partitionKey string) *KeyDispatcher {
    28  	return &KeyDispatcher{
    29  		partitionKey: partitionKey,
    30  	}
    31  }
    32  
    33  // DispatchRowChangedEvent returns the target partition to which
    34  // a row changed event should be dispatched.
    35  func (t *KeyDispatcher) DispatchRowChangedEvent(*model.RowChangedEvent, int32) (int32, string, error) {
    36  	return 0, t.partitionKey, nil
    37  }